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x67y is exactly divisible by 9 The sum of its digits must be divisible by 9 x + 6 + 7 + y = x + y + 13 is divisible by 9 Minimum value x + y must be equal to 5 because then the sum will be 18 and it is divisible by 9. ∴ The least value of (x + y) is 5.
The ratio between two numbers is 1:2. If each number is increased by 8, the ratio between then become 5:6, find the difference between numbers.
Two numbers are in the ratio 7:5. After adding 2 and 4 to them respectively the ratio becomes 2:3. Find the bigger number.
What number has to be added to each term of 2:3 to make the ratio 4:5?
